Electric heater.



W. STANLEY.

ELECTRIC HEATER. l r APrLIoA'rIox FILED In 13. 1909. BEIBWED APB. 1o, 1912.

1,046,888. v Patented Dec. 10, 1912.

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l a a I 1 1U 'l MTNESSES/ INYL'NTDR m I@ N I .BY I/I/LLMM STIAvNLz'Y lW. STANLEY.

ELECTRIC HEATER. D MAY 13,1909. RBNBWBD APR.10, 1912.

1,046,888. Patented Dec. 10, 1912.

1 2 SHEETS-SHEET 2.

l APPLIGATION FILE mxmm, l E,

/1 u@ zw UNITED sTATEs PATENT oEEioE. j

WILLIAM'STANLEY, OF GREAT BAIRLRINGirlI0N, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRIC HEATER.'

Specification of Letters Patent.

Patented Dec. 10, 1912.

A Application led May 13, 1908, Serial No. 495,754. Renewed April 10, 1912. Serial No. 689,900. g

To all whom it may concern:

Be it known that I, WILLIAM STANLEY, a citizen of the United States, residing at Great Barrington, county State of Massachusetts, have inventedcertain new and useful Improvements in Electric Heaters, of which the following is a specication,

This invention relates to resistance devices,

such as heaters and the like, and has for its object the provision of a device of this character in which the electric energ is transformed into yheat in a simple, e cient and reliablel manner.

- Oneof the objects of -my invention is to produce an electric heater in which the heat ing unit is arranged so as to be in the most intimate thermal relation possible with the body to be heated.

The ideal condition for an electric heater `is to have a minimum thickness of insulation surrounded at every point by a mass of heat conducting metal in intimate thermal relation with it, so that the heat will be conduced away quickly to the place where it is to be applied. In myprevious application, Serial N o. 495,753, filed May 13, 1909, I have disclosed and 'claimed broadly the process whereby this desired result may be brought about.

. disclose a method of casting the resistance without injuring 'manner to the body to bottom of the receptacle. The unit is in the form of a fiat ring with its surface parallel vith the walls of the receptacle and the terminals are brought out at'the bottom. The unit, before it is cast in place, may be constructed in the manner disclosed in my previous application, namely, by winding a resistance conductor upon a strip of thin insulating material such as mica and inclosing the conductor in a metallic shield to protect it from the heat of thecast metal. Y

In the accompanying drawing, in which I have shown my invention embodied in concrete form, Figure l represents a longitudinal sectional view of the bottom portion of vthe heater; Fig. 2 represents a fragmentary of Berkshire,

In the said application IV transverse section of the same; Fig. 3 represents a fragmentary view of the unit before it is cast in; Fig. 4 holding the unit in place during casting; Fig. 5 shows the arrangement of the unit in a sand mold; Fig. 6 shows the unit cast in a slightly modified form; Fig. 7 shows a fragmentary perspective lview of the unit; and Fig. 8 shows a detail of the receptacle at a point where the terminals are brought out.l

Referring to the drawings, 10 represents the heating unit which is cast in the side walls'of the vessel'll in the bottom of the receptacle. This unit I have shown in the form4 of a ring or dog collar that is, cast with the fiat surface parallel with the walls.`

The `construction my previous application and will require no detailed description. Briefly, it consists of a strip of insulating material 12 such as mica or Ithe like, bent fiatjwise in the form of a ring and having a resistance conductor 13 preferably of the 'ribbon type jwound around the strip. This ribbon wound strip is then placed between two rings 14 of be a metal having a higher fusing point than that of the cast metal 11, as lfor instance, A

iron or steel. Terminals `16 are brought out through the insulation, as shown in Figj3. The unit is then secured in the clips 17, a. detail of which is shown in Fig. 4. These clips are embedded in sand, as shown in Fig. 5, and hold the unit rigid so that the metal may be poured'around it. This metal may be aluminum or soft metal, or if desired. A core 18 is formed around the terminals so as to protect them and form an openingthrough the iron for the terminals. vThevessel is preferably provided with lugs l rying the terminal pins is secured.

In Figs. 6 to 8 I have shown `a slightly modified form. In the form shown in Figs. 1 to 5 the resistance-unit is in the form of a continuous ring and the terminals are brought out through the side ofthe ring.

In Figs. 6 to 8 I have shown a slightly are bent outward, as shown at 21, and these ends project`through the cast metal. The unit, however, in place, is'the same as that above described.

While I. have `shown 'my invention embodied in concrete form for purposes of insulating material and is. inclosed in a metallic casing 15 which must may be iron,

to which the insulating plate 20, for carrepresents a clip for and the method of casting it illustration, it do not limit my invention thereto? since various modifications thereof will suggest themselves to those skilled in the artivvithout departing from the spirit of my invention, the scope of neXed claims. What I claim as new and desire to secure by Letters Patent of the 'United States, is,-

f 1. An' electric heater receptacle having a resistance conductor cast into its side Walls adj acent the bottom of the receptacle. A

2. A11 electric heater comprising a iuid Corrections in Letters Patent No. 1,046,888'.

`for an improvement in vreadQ :onducteck and same page, linev 104, omit the-paragr ph 3, An .electric heater comprising a iuid receptacle having a fiat resistance strip cast in its Walls in the form yot a; ring with its flat surface parallel With the Walls.

4. A tluid receptacle having a resistance unit cast in its side Walls adjacent the bot.- tom, said unit comprising an insulating strip 'in the form of a ring having a resistance conductor Wound thereon and inclosed in a metallic casing. Y

In Witness whereof I have hereunto set my hand this 6th day of May, 19y09.

WILLIAM STANLEY.

Should be understood that i which is set forthin the an` comprising a uid Witnesses receptacle having an annular resistance unit cast in its Walls adjacent the bottom of the I. A. SMrrH, receptacle. F. G. LARAMEE.

Itis hereby certiied that in Letters Patent No. 1,046,888, granted December 10,

of Great Barrington, Massachusetts,

19125, upon the application otWilliam Stanley,

Electric Heaters, errors appear in the printed specification requiring correction -as follovvs: Page 1, lines 24g-25, for the Word conduced I indentation and for the Words I have shown a slightly insert a comma and the Words however. the ends ofthe wlng," and that the said Letters Patent shouldbe read With these corrections therein that the saine may conform to the record'of the case in the Patent 0iice.. l

Signed and sealed this 21st day of anuary, AL D., 1913. [SEAL] c; c; BILLiNes,

Acting Garanties/anar of Patents. 

